Polymer thick film (PTF) resistors were fabricated using a new laser-based
transfer technique called matrix-assisted pulsed laser evaporation direct w
rite (MAPLE-DW). MAPLE-DW is a versatile direct writing technique capable o
f writing a wide variety of materials on virtually any substrate in air and
at room temperature. Epoxy-based PTF resistors spanning four decades of sh
eet resistances (10 Omega /sq. to 100 k Omega /sq.) were deposited on alumi
na substrates under ambient conditions. Electrical characteristics or these
MAPLE-DW deposited resistors were studied at a wide frequency range (I MHz
to 1.8 GHz), and the results were explained through an equivalent circuit
model and impedance spectroscopy. Temperature coefficient of resistance mea
surements for the PTF resistors were performed between 25 and 125 degreesC.
The results based on the percolation theory were used to explain the tempe
rature dependence of the resistance behavior of the PTF resistors.